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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Schedule of basic and diluted earnings per common share from continuing operations
The following table presents the calculation of basic and diluted earnings per common share from continuing operations:
 
Three months ended March 31,
 
2013
 
2012
 
(In thousands, except per share amounts)
Earnings per share — Basic:
 
 
 
Earnings from continuing operations
$
40,802

 
34,876

Less: Distributed and undistributed earnings allocated to nonvested stock
(403
)
 
(462
)
Earnings from continuing operations available to common shareholders — Basic
$
40,399

 
34,414

 
 
 
 
Weighted average common shares outstanding — Basic
50,958

 
50,485

 
 
 
 
Earnings from continuing operations per common share — Basic
$
0.79

 
0.68

 
 
 
 
Earnings per share — Diluted:
 
 
 
Earnings from continuing operations
$
40,802

 
34,876

Less: Distributed and undistributed earnings allocated to nonvested stock
(403
)
 
(460
)
Earnings from continuing operations available to common shareholders — Diluted
$
40,399

 
34,416

 
 
 
 
Weighted average common shares outstanding — Basic
50,958

 
50,485

Effect of dilutive equity awards
435

 
436

Weighted average common shares outstanding — Diluted
51,393

 
50,921

 
 
 
 
Earnings from continuing operations per common share — Diluted
$
0.79

 
0.68

 
 
 
 
Anti-dilutive equity awards not included above
1,413

 
1,453